I am inclined to think that the authority of Holy Scripture is intended to convince men of those truths which are necessary for their salvation, which, being far above man's understanding, can not be made credible by any learning, or any other means than revelation by the Holy Spirit.

I have never met a man so ignorant that I couldn't learn something from him.

With regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them.

Alas! Your dear friend and servant Galileo has been for the last month hopelessly blind; so that this heaven, this earth, this universe, which I by my marvelous discoveries and clear demonstrations had enlarged a hundred thousand times beyond the belief of the wise men of bygone ages, henceforward for me is shrunk into such a small space as is filled by my own bodily sensations.

They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.

I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.

God is known by nature in his works, and by doctrine in his revealed word.